At least, that was the idea. Revolutionary as the Julian calendar was, it wasn't perfect, and fell out of alignment over time. In 1582, Pope Gregory XIII introduced the Gregorian calendar ...
The original Roman calendar divided the year from March to December into 10 months of either 29 or 31 days, based on lunar ...
In 1752, from Sept. 3rd to 13th, people witnessed a unique historical event. Eleven days were cut from the calendar and deleted forever.